Carburetor



Aug. 18, 1925;

J. SANTOUX CARBURETOR Filed June 25, 1920 2 Sheets-Sheet 1 W WW WM J. SANTOUX Aug; 18, 1925. 1,550,328

CARBURETOR Filed J qn9 25, 1920 2 Sheets-Sheet 2 Patented Aug. 18, 1925.

UNITEDSTATES JOACHTM SANTOUX, OF LYON, FRANCE.

cARBURE'ron.

To all whom it may concern Be it known that I, J OACHIM Six'roux, a citizen of the Helvetic- Republic, residing at Lyon, France, have invented new and useful Improvements in Carburetors, of which the following is a specification.

This invention relates to carburetors principally intended for use in internal combustion engines, the main object of the invention being; to provide a device in which the degree of vacuum on the spraying nozzle is variable and adjustable so that the carburetor will automatically adjust itself to the requirements of the full range of the engine speeds. This result is obtained by automatically varying the cross-sectional area of the intake passage adjacent the nozzle. This variation may be accomplished by various means, the simplest means being to providein the intake passage a square or rectangular cross section, and to locate in this passage two shutters diametrically opposed and each. of said shutters being connected to a spindle at its basc, which spindle is located perpendicular to the axis of the spraying-nozzle.

The shutters are provided at their upper edges with notches which, when thershutters are in closed position, form a small passageway between the shutters. This passageway prevents the passage to the engine intake of a small quantity of air and fuel mixture for idling orstarting purposes.

As the throttle is opened the o iiening between the shutters is progressively increased and the intake passage proportionately enlargeol, thus preventing as rapid increase in vacuum at the nozzle as would otherwise occur.

In the drawings accompanying and forming part'of this specification,

Fig. 1 is a vertical section taken at right angles to Figure 2.

Fig. 2 is a verticak section along the middle longitudinal line of the body of the carburetor Fig. 3 is a section taken on theline B--B of Fig.1 looking upwardly and Fig. 4 is an end view of the carburetor shown in Fig. 2 showing the mechanism foroperating the shutters for the air-inlet.

Similar characters of reference indicate corresponding parts throughout all figures of the drawings.

The upper part fie in which the throttle valve p is located is of cylindrical section.

Application filed June 25,

1920. Serial no. 391,641

eral section being rectangular, the vertical side walls a being parallel to one another,

while the side walls a are so formed as to I make an angle as shown in Figs. 2 and 4.

The narrowed top of the sides a a of the body 'are united with the cylinder a and form the chamber 0 above the spraying nozzle and shutters. The enlarged bottom 0 is open tothe atmosphere as shown.

On one of the walls a there is aflixed the float chamber 2, which is of the usual construction, the opposite wall 09 having a projecting portion a which is longitudinally bored and has located therein a helical spring 1 which is located on arod this spring is held within a fixed plug 70 screwed in the bottom of the portion (1., and a ring 12 fixed by a pin 92. at the upper end of the rod j. The lower end of this rod is provided with a grooved roller m. The spring 1'- acts to constantly push the rod upwardly in order to maintain thetip of it in permanent touch with a cam (1 located above the same and which cam is affixed to an extension 7)" of the axle Z of the throttle valve p.

The shutters o are provided with axles z. the ends of which rotate in the bottom of the side walls (1.. These shutters are of very substantial construction, as shown in Fig. 2, in order that the transverse upper rim of each, which is cut as a bevel, may offer a broad surface 41 as shown in Fig. 1. The lower face of both shutters is deepened so as to make up a hollow a similar to the hollow of a spoon. The upper rims of the shutters are notched in the middle so as to make up the circular aperture 0 when the shutters are brought against each other, said aperture being then placed directly above the orifice mouth of the spraying nozzle 7, as shown in Figs. 2 and 3.

One of the slanting sides a has connected thereto a nipple t axially bored by an opening having two diameters 3/, 3 the intersection of which forms a conical shoulder for the seat of a needle valve m secured in the upper part of said opening. The smaller diameter '1: opens in the upper part of the chamber 0 so as to admit to the chamber 0 the atmospheric air entering through the cured thereto at one end the rods 6, which sition of the valve and the rods 6 are oscillatied by the to-and-fro movement of the r0 y.

The operation of the device is as follows: The throttle valve 39, which is operated by the lever Z, moves the cam g. This cam g is located directly above the rod j and bears thereon, so that, according to the direction of rotation of the lever Z, the cam forces downwardly the rod 7' and compresses the spring 1', or permits the rod to moveupwardly by means of the tension of said spring '1'. The downward movement of said rod j will tend to close the valve 10, and at the same time will bring downwardly the rods 6, thus bringing the shutters 12 towards each other, while the upward movement of the rod j under tension of the spring will tend to open the valve ;0 and at the same time force up the rods 6 and thus open the shutters '0. It will thereforebe noted that the position'of the shutters ois positively controlled by the position of the throttle valve p.

Supplementary air is introduced into the chamber a through the passages to and 'y, and the supply of air is adjustable by means of the needle valve :0 to form a mixture of entirely closed by screwing in the punch m.

It will, of course, be understood that various changes and modifications may be made to the details of construction without in any way departing from the spirit or scope of the present invention.

I claim:

In acarburetor, a liquid'fuel chamber, a v

pair .of mutually separable shutters each having a notch at its upper end and forming an air intake communicating with said chamber, a throttle valve disposed in the upper portion of .the carburetor, a pivoted lever connected with said valve for operating the same, a cam operatively connected to said lever, a rodnormally maintained under tension in contact with said cam, a grooved roller secured at the lower end of said rod, a pair of spindles and a pair of levers each connected at one of its ends to'one of sald spindles, the opposite ends thereof being in contact with the grooved roller, the shutters also being pivotally connected at their lower ends to the spindles so that upon actuation of the valve the shutters will also be operated to open or close the same.

In testimony whereof I have signed my name to this specification.

JOAOHIM SANTOUX. 

